Experimental Pricing As an Approach to Demand Analysis 35




 TABLE 1.-BASIC TABLE FOR ANALYSIS OF COVARIANCE.


 Factor I D.F. SSZ' SSX'9 SCPZ'X'g


Stores ......--........-- ........... ...... 9 0.817668 0.272253 0.294918
Age ....--- ...........------................ 2 0.000740 0.030366 -0.003292
Weeks (within age) .............. 6 0.054196 0.151832 -0.048523
Stores x Age .----...........- ----... 18 0.008781 0.022688 -0.007932
Remainder (1) ............. ......... 54 0.041282 0.814347 0.012155
Total ......................-- .......-- .. 89 0.922667 1.291486 0.247326
Remainder (1) + Age ......... 56 0.042022 0.844713 0.008863





TABLE 2.-TEST OF REDUCTION IN SUM OF SQUARES DUE TO FITTING X',.

 II
 Factor D.F. SS MS F


Reduction due to fitting X'9 ...... 1 0.000181 0.000181 <1
Remainder (2) ....--...------........ 53 0.041101 0.000775





 TABLE 3.-TEST OF REDUCTION IN SUM OF SQUARES DUE TO FITTING
 AGE CONSTANTS.

 II I I
 Factor D.F. SS MS F

Adjusted (Remainder + Age).. 55 0.041929
Remainder (2) .--..... ---............--53 0.041101 0.000775
Adjusted Age -.....--...........----. 2 0.000828 0.000414 <1